*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    color-scheme: dark;

    /* Precision Console — Obsidian Red: aligned with the shipping Qt palette. */
    --color-canvas: #0E0F12;
    --color-canvas-raised: #0A0B0E;
    --color-chrome: #07080A;
    --color-surface-1: #090A0D;
    --color-surface-2: #0E1014;
    --color-surface-3: #111216;
    --color-depth-start: #111216;
    --color-depth-end: #0C0D10;
    --color-border: rgba(145, 150, 160, .19);
    --color-border-strong: #64748B;
    --color-text: #F3F6FB;
    --color-text-muted: #94A3B8;
    --color-text-subtle: #718096;

    /* Interaction and semantic roles. */
    --color-accent: #EF4444;
    --color-accent-hover: #F87171;
    --color-accent-soft: rgba(239, 68, 68, .12);
    --color-focus: #F87171;
    --color-action-fill: #F3F6FB;
    --color-action-text: #07080A;
    --color-danger: #EF4444;
    --color-success: #22C55E;
    --color-warning: #F59E0B;

    /* Typography */
    --font-body: 'IBM Plex Sans', sans-serif;
    --font-display: 'Bebas Neue', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-12: 48px;
    --space-16: 64px;
    --space-24: 96px;

    /* Layout */
    --container-standard: 1180px;
    --container-reading: 760px;
    --container-form: 440px;
    --gutter-page: 40px;
    --nav-h: 64px;

    /* Shape, elevation, focus, and motion */
    --radius-sm: 6px;
    --radius-control: 8px;
    --radius-chip: 999px;
    --radius-md: 10px;
    --radius-card: 12px;
    --radius-panel: 14px;
    --shadow-overlay: 0 16px 40px rgba(0, 0, 0, .32);
    --focus-ring: 3px solid var(--color-focus);
    --focus-offset: 2px;
    --motion-color: 140ms ease;
    --motion-transform: 180ms ease;
    --motion-overlay: 220ms ease;
    --motion-reveal: 220ms ease;

    /* Compatibility aliases for Stage 3C/3D-owned views */
    --bg: var(--color-canvas);
    --bg2: var(--color-canvas-raised);
    --bg3: var(--color-surface-1);
    --card: var(--color-surface-1);
    --card-hover: var(--color-surface-2);
    --color-blue: #5F86FF;
    --color-blue-action: #365FCF;
    --color-blue-hover: #3B64D9;
    --color-cyan: #46CFE0;
    --color-purple: #8B73E8;
    --blue: var(--color-blue);
    --blue-hi: var(--color-cyan);
    --blue-dim: var(--color-blue-action);
    --cyan: var(--color-cyan);
    --green: var(--color-success);
    --red: var(--color-danger);
    --amber: var(--color-warning);
    --text: var(--color-text);
    --muted: var(--color-text-muted);
    --muted2: var(--color-text-subtle);
    --border: var(--color-border);
    --border-hi: var(--color-border-strong);
    --r-sm: var(--radius-sm);
    --r-md: var(--radius-md);
    --r-lg: var(--radius-card);
    --r-xl: var(--radius-panel);
    --glow-blue: none;
    --glow-cyan: none;
    --site-bg-base: var(--color-canvas);
    --site-bg-mid: var(--color-canvas-raised);
    --site-bg-deep: var(--color-canvas);
    --site-surface: var(--color-surface-1);
    --site-surface-strong: var(--color-surface-2);
    --site-surface-border: var(--color-border);
    --site-surface-shadow: none;
}

html {
    min-height: 100%;
    background: var(--color-canvas);
    scroll-behavior: smooth;
    scrollbar-color: var(--color-border-strong) var(--color-canvas);
    scrollbar-width: thin;
}

body {
    min-height: 100%;
    position: relative;
    overflow-x: clip;
    background: var(--color-canvas);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

body::-webkit-scrollbar {
    width: 12px;
}

body::-webkit-scrollbar-track {
    background: var(--color-canvas);
}

body::-webkit-scrollbar-thumb {
    border: 3px solid var(--color-canvas);
    border-radius: 999px;
    background: var(--color-border-strong);
}

body::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-subtle);
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse 68% 46% at 16% -12%, rgba(127, 29, 29, .08), transparent 70%);
}

#site-shell,
.page {
    min-height: 100vh;
}

.page {
    position: relative;
    z-index: 1;
    padding-top: var(--nav-h);
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
}

button {
    border: 0;
    background: none;
    color: inherit;
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
}

img,
svg {
    display: block;
    max-width: 100%;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.aurora-wrap,
.dot-grid,
.grain,
.vignette,
.edge-vignette {
    display: none;
}

.grid-bg {
    position: fixed;
    inset: 0 0 auto;
    z-index: 0;
    height: min(760px, 100vh);
    pointer-events: none;
    opacity: .024;
    background-image:
        linear-gradient(rgba(145, 150, 160, .45) 1px, transparent 1px),
        linear-gradient(90deg, rgba(145, 150, 160, .45) 1px, transparent 1px);
    background-size: 64px 64px;
    mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, .72) 54%, transparent 100%);
}

@media (max-width: 980px) {
    body {
        --gutter-page: 28px;
    }
}

@media (max-width: 720px) {
    body {
        --gutter-page: 20px;
    }
}